Those aren’t stars in the sky, they’re ice crystals floating around. As I was photographing this morning’s sunset I looked up an noticed the crystals sparkling in the light. I don’t remember ever seeing that before. I took some photos but wasn’t sure they’d show up in the images. At one point a faint ice-bow appeared on the horizon, but it was not visible in the pictures I took.
I made basic adjustments in Adobe Camera Raw and added a curves adjustment layer in Photoshop.